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per•i•stome

Pronunciation: (per'u-stōm"),[key]—n.1. Bot.the one or two circles of small, pointed, toothlike appendages around the orifice of a capsule or urn of mosses, appearing when the lid is removed.
2. Zool.any of various structures or sets of parts that surround or form the walls of a mouth or mouthlike opening.